Today, in accordance with the President's proclamation, all flags on public buildings and grounds should be be lowered to half-staff in remembrance and as a mark of respect for the victims of the senseless act of violence perpetrated on May 26, 2021, in San Jose, California and remain at half-staff until sunset, Sunday May 30, 2021.
All flags flying with the US Flag should also be lowered. If you have a flag that cannot be lowered respect can be shown by tying a black ribbon or cord at the top of the staff.
As flags are to be lowered again at sunrise Memorial Day, May 31 I would recommend they remain at half staff until noon, May 31.
Read the Presidential Proclamation here: https://www.whitehouse.